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Microchip Technology 1N5221BE3
- Part No.:
- 1N5221BE3
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5221BE3.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,540
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Product details
Overview
1N5221BE3 from Microsemi is a 2.4 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 30 Ω dynamic impedance at IZK, operating from –65°C to +175°C. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback paths, and overvoltage protection.
For engineers reviewing the 1N5221BE3 datasheet, 1N5221BE3 pinout, 1N5221BE3 application, or 1N5221BE3 equivalent, key selection criteria include its 2.4 V nominal Zener voltage with tight ±5% tolerance (B suffix), 500 mW power rating at 25°C, DO-35 mechanical compatibility, and RoHS-compliant matte-tin plating (e3 suffix).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its regulation relies on controlled avalanche and Zener mechanisms depending on voltage level, with thermal resistance of 250°C/W junction-to-lead at 10 mm lead length.
The device exhibits minimal capacitance (typical <2 pF per Figure 2), low forward voltage (≤1.5 V @ 200 mA), and inherent radiation hardness per MicroNote 050. It is ESD-insensitive per MIL-STD-750 Method 1020 and supports axial-lead through-hole mounting with cathode band polarity marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 2.4 V @ 20 mA test current - defines regulated output voltage under standard bias |
| Tolerance | ±5% (B suffix) - ensures voltage accuracy within 2.28–2.52 V at 25°C |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous power before thermal derating applies |
| Zener Impedance (ZZT) | 30 Ω @ IZK = 0.25 mA - indicates voltage stability under small-signal AC perturbation |
| Operating Temperature | –65°C to +175°C - enables use in extended industrial, aerospace, and downhole environments |
| Thermal Resistance | 250°C/W junction-to-lead - determines temperature rise per watt dissipated with 10 mm lead length |
| Forward Voltage | ≤1.5 V @ 200 mA - defines conduction threshold in forward bias, relevant for polarity protection |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by single black band; weight 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower potential side during Zener operation; forward conduction path when biased positively |
| Cathode | Banded end | Connected to higher potential side during Zener regulation; defines breakdown voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with JEDEC 1N5221 standard for 2.4 V ±5% regulation, ensuring cross-manufacturer interchangeability |
| RoHS-compliant finish | e3 suffix denotes annealed matte-tin plating per MIL-STD-750 Method 2026, enabling lead-free assembly compatibility |
| Wide temperature range | –65°C to +175°C operation supports deployment in harsh environments without derating penalties below 25°C |
| Low capacitance | Typical <2 pF (per Figure 2) minimizes signal coupling in high-frequency or RF-adjacent circuits |
| Radiation hardness | Inherently radiation-hardened per MicroNote 050 - suitable for space-grade and nuclear instrumentation applications |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
|
Use Scenario: Stabilizing output voltage in linear regulators or switching converter feedback loops. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 2.4 V reference to error amplifier input. Use Value: Enables ±5% output regulation accuracy over temperature and line/load variations using minimal board area. |
Use Scenario: Protecting downstream ICs from transient voltage spikes exceeding 2.7 V. IC Role / Device Role / Timing Role: Fast-acting clamping element diverting excess current to ground when voltage exceeds 2.52 V (max VZ). Use Value: Limits peak voltage to safe levels without requiring active control circuitry or response timing. |
| Temperature-Stable Reference | Low-Power Sensor Biasing |
|
Use Scenario: Providing stable bias for precision analog sensors in industrial monitoring systems. IC Role / Device Role / Timing Role: Low-drift 2.4 V reference source with αVZ = –0.085 %/°C for ratiometric measurement circuits. Use Value: Maintains reference accuracy across –40°C to +85°C ambient with predictable, linear drift compensation. |
Use Scenario: Supplying excitation voltage to resistive temperature detectors (RTDs) or bridge sensors. IC Role / Device Role / Timing Role: Low-noise, low-capacitance voltage source delivering stable 2.4 V at ≤1 mA quiescent current. Use Value: Minimizes self-heating error in RTDs while avoiding signal integrity degradation from parasitic capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, ±5%, same DO-35 package, 1.0 W power rating | Higher voltage and power - unsuitable for 2.4 V reference but usable where headroom allows | Select only if system requires ≥3.3 V regulation and can accommodate higher power dissipation |
| BZX55C2V4 | 2.4 V nominal, ±5%, DO-35 package, 500 mW rating, but tighter ZZT = 100 Ω @ IZK | Lower dynamic impedance improves regulation under fast transients, but lacks radiation hardness documentation | Prefer for commercial-grade consumer electronics where radiation immunity is not required |
Compared with 1N5221BE3, 1N4728A offers higher voltage and power but cannot replace it in 2.4 V circuits, while BZX55C2V4 matches voltage and power but omits radiation hardening and military screening options critical for aerospace or defense designs.
Availability
1N5221BE3 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and temperature-stable reference applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1N5221BE3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-temperature analog and mixed-signal components.
The 1N5221BE3 belongs to Microsemi's legacy 1N52xxB Zener series designed for precision voltage regulation in aerospace, defense, and industrial systems demanding extended temperature operation and reliability.
FAQ
What is the Zener voltage tolerance of the 1N5221BE3?
The 1N5221BE3 has a nominal Zener voltage of 2.4 V with a tolerance of ±5%, designated by the "B" suffix in the part number. This means the actual breakdown voltage falls between 2.28 V and 2.52 V when measured at 20 mA test current and 25°C ambient temperature, as confirmed in the Electrical Characteristics table on page 1 of the Microsemi datasheet.
Is the 1N5221BE3 RoHS compliant?
Yes, the 1N5221BE3 is RoHS compliant, indicated by the "e3" suffix. It features annealed matte-tin plating per MIL-STD-750 Method 2026 and is qualified for lead-free soldering at 260°C for 10 seconds maximum, making it suitable for modern environmentally regulated manufacturing processes.
What is the maximum power dissipation of the 1N5221BE3 at 25°C?
The 1N5221BE3 has a maximum power dissipation of 500 mW at 25°C ambient temperature, as specified in the Maximum Ratings section. Derating begins above 25°C at 4 mW/°C (250°C/W thermal resistance), reducing allowable power linearly to zero at 175°C case temperature.
Does the 1N5221BE3 have radiation hardness certification?
Yes, the 1N5221BE3 is inherently radiation-hardened per MicroNote 050, a documented characteristic of the 1N52xxB family. This makes it suitable for use in space, nuclear, and high-radiation terrestrial environments where total ionizing dose (TID) resilience is required.
How is polarity marked on the 1N5221BE3 package?
The 1N5221BE3 uses a single black band on the glass DO-35 body to indicate the cathode terminal. During Zener regulation, the banded end must be held at a higher potential than the anode (non-banded end); reversing polarity places the device in forward conduction with ≤1.5 V drop at 200 mA.
1N5221BE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bag
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5221BE3 FAQ
1.How can I place an order for 1N5221BE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5221BE3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N5221BE3 reliable?
The price and inventory of 1N5221BE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5221BE3 is usually 5 days.
3.What payment methods are accepted for 1N5221BE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5221BE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5221BE3?
1N5221BE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5221BE3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N5221BE3?
For technical support, including 1N5221BE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5221BE3 requirements.
6.How does Aetrix verify that 1N5221BE3 is sourced from the original manufacturer or authorized distributors?
All 1N5221BE3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N5221BE3 meets industry standards.
7.What is the process for return or replacement of 1N5221BE3?
All 1N5221BE3 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5221BE3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N5221BE3 part is unused and in its original packaging.
Return procedure for 1N5221BE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5221BE3 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
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